Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcc172fce8742ae…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 17:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 447e79c3cd882eb6da46bb5d0f7aff48 SHA-1: 2dd3817a26f927135a2e3bd75a2544a82ecd67b6 SHA-256: fdcc172fce8742aeb216bed467616d291b16000d02929d07c8de825f40b0512a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to other PDFs hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=free+gimp+2.8+manual+download PDF link annotation
    • http://majstrissmt.eu/www-data/file/tifewajesobowame.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea01f8516c---jojiwilolonegodiwamub.pdfIn PDF document text
    • http://nscenter.cn/upload/files/45411044900.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355dcddb138---67404430477.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/52794649307.pdfIn PDF document text
    • http://retailcop.ca/files/xasibagojoboteninirawifek.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/15541730650.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/gilejeforova.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/83983412621.pdfIn PDF document text
    • http://cycling-software.com/files/file/sowojesewibigovi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613831d31dd3b---posus.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/32658369232.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/81773845067.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/34297682752.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/90092401513.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630558806.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/80763242618.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/66575201536.pdfIn PDF document text
    • http://netflor.pl/upload/File/sebukaneriwolop.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/sozusabox.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf888c132---26730069685.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/getusafogal.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 11024 bytes
SHA-256: 637bc90d6a78634fac3d35d0a5ea85ce22f7bb586e21d9b6ca78352c8a949b04
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 18040 bytes
SHA-256: 32eb9850007e8f533aa8f7d1e993750ddb75c9d3fddaee971dc1eab0af03c43d

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